You cannot directly convert .spb files to .sbu and no spb to sbu conversion seems possible. You would have to recover the contacts saved in .spb file using Samsung Kies and then proceed to again backup your device (not only contacts) to pro a .sbu file. There doesn't seem to be any other way to do this conversion, although it is not conversion in proper sense.
Home > Search converters: spb to sbu
Conversion of spb file format to sbu file format beta
Search for spb to sbu converter or software able to handle these file types.
Convert Samsung Kies exported phone contacts library to Samsung Kies backup.
We have found 2 software records in our database eligible for .spb to .sbu file format conversion.
Microsoft Windows software 
- convert spb to sbu on Windows
Samsung Kies
A free software for managing of latest Samsung mobile devices
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from spb file | Yes, Samsung Kies supports spb file conversion as a source file type. | Yes | Yes | spb editor | Yes | No | No | No |
to sbu file | No | No | No | No | Yes | No | No | No |
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned spb to sbu. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software 
- convert spb to sbu on OS X
Samsung Kies for Mac
A management and sync utility for Samsung mobile devices
Additional links: Open spb file, Open sbu file
SPB
Files with spb extension is mainly known to be used for a contact backup exported by Samsung Kies management software for various Samsung smart phones.
SBU
Files with sbu extension can be commonly found as smartphone backups preformed using the Samsung Kies software. Used to restore contacts and other data to the device.
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